It is the first fatality on Caltrain tracks in 2013. The last time someone was killed on the tracks was Dec. 14 when a 56-year-old man was struck at Hayward Park station in San Mateo. There were 12 fatalities in 2012, eight of which were considered suicide. The rest remain under investigation.

Around 10:15 p.m., Caltrain announced that trains were single-tracking through the area and no further delays are expected.

"The cause of death is under investigation and will be determined by the county coroner," read a Caltrain statement. "No matter what the circumstances, any fatality is regrettable. Caltrain apologizes to its passengers for the significant delays caused by tonight's fatality and thanks everyone for their patience and understanding as we deal with these tragedies."